Using the sendcoins command
Please note that the functionality described here is best left to advanced users.
In some cases, like channel closures, users' funds might be deposited automatically into Breez's built-in (on-chain) Bitcoin wallet. If this occurs, we strongly recommend sending the funds to a secure BTC address as soon as possible. Breez offers an Unexpected Funds screen to facilitate this process.
However, the funds may not suffice to initiate a transaction and cover the fees incurred. To send the funds with a minimal fee, enter the following command in the Preferences > Developers screen:
sendcoins --sweepall=1 --addr=dest-btc-address --sat_per_byte=10